This may be fading, at least a bit. One administrator of a top CS department told me that a number of the tenured professors were coming back from their time in

This may be fading, at least a bit. One administrator of a top CS department told me that a number of the tenured professors were coming back from their time in industry rather than give up their tenure. So it would be easy this fall to staff the courses. The recent 10-15% layoffs around the FAANNNG world was the source. In general, tenured academics can't code.